CyberCertPrepOT Security FundamentalsOT Fundamentals: Safety Systems & Physical SecurityEASYFree question
A field instrument is designed so that a loss of signal, power, or air pressure drives the final element to its safe state. This characteristic is best described as which design philosophy?
- A.Fail-secure
- B.Fail-operational
- C.Fail-as-is
- D.Fail-safe
Why D is correct
Fail-safe design ensures that a failure or loss of energy moves the process to a state that minimizes harm, such as de-energizing a valve closed. This contrasts with fail-secure, which prioritizes maintaining a locked or protected state even at the expense of process availability.
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